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The Journal of General Physiology, Vol 46, 999-1010, Copyright © 1963 by The Rockefeller University Press

ARTICLE

The Effect of Ca and Antidiuretic Hormone on Na Transport across Frog Skin

I. Examination of interrelationships between Ca and hormone



Francisco C. Herrera 1 and Peter F. Curran 1

1 From the Biophysical Laboratory, Harvard Medical School, Boston.

Dr. Herrera's present address is Instituto Venezolano de Investigaciones Cientificas (I.V.I.C.), Caracas, Venezuela

Ca added to the solution bathing the outside of isolated frog skin causes a decrease in net Na transport across the skin while antidiuretic hormone (ADH) causes an increase. Possible interrelations between the effects of these agents have been examined. The decrease in Na transport caused by Ca was the same before and after treatment of the skin with ADH and the increase in transport caused by ADH was unaffected by the presence of Ca. The relationship between Ca concentration and degree of inhibition of Na transport was not appreciably altered by ADH. These results indicate that Ca and ADH do not compete but act independently at two different sites and these sites appear to be located on the same barrier to Na movement in the skin. Further, Ca causes a decrease in Cl influx across the short-circuited skin but ADH has no effect on Cl movement, again suggesting that the actions of these agents are independent.

Submitted on October 16, 1962


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